400444264644 has 48 divisors (see below), whose sum is σ = 988035611136. Its totient is φ = 126024940800.

The previous prime is 400444264621. The next prime is 400444264673. The reversal of 400444264644 is 446462444004.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 400444264596 and 400444264605.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13112347 + ... + 13142850.

It is an arithmetic number, because the mean of its divisors is an integer number (20584075232).

Almost surely, 2^400444264644 is an apocalyptic number.

It is an amenable number.

400444264644 is an abundant number, since it is smaller than the sum of its proper divisors (587591346492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400444264644 is a wasteful number, since it uses less digits than its factorization.

400444264644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26255276 (or 26255274 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 42.

The spelling of 400444264644 in words is "four hundred billion, four hundred forty-four million, two hundred sixty-four thousand, six hundred forty-four".